I find that in 7.0 you have changed product quantity display to be updated on add-to-cart clicks. I find this to be a really bad idea that will result in lower sales.
This is not a behavior the customer will expect, and if you have one item of something in the store, this is added to the cart, the product will display "out of stock". I strongly believe this will cause a lot of customers to abort the purchase and not place the order.
At least store owners must be able to switch this feature on or off!
Anyone with opinions on the subject?